Ribbed pipe coupling



FIG. 1 is an isometric view of our design for a ribbed pipe coupling;

FIG. 2 is a front view of the design for a ribbed pipe coupling shown in FIG. 1, the rear view being identical;

FIG. 3 is a top view of the design for a ribbed pipe coupling shown in FIG. 1;

FIG. 4 is a bottom view of the design for a ribbed pipe coupling shown in FIG. 1; and,

FIG. 5 is a left side view of the design for a ribbed pipe coupling shown in FIG. 1, the right side view being identical.

The broken lines in FIGS. 1–5 are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a ribbed pipe coupling, as shown and described. 